Alarm mechanism



L. A. ENGELMAN.

ALARM MECHANISM. APPLICATION FILED FEB-.3. I915.

1,193,457. PatentedAug. 1,1916.

I 2 w 721. M 42 am; 1

mu Iva/ems PETERS ca, r-nomuma musnmcmm a a LOUIS A. ENGELMAN, OF LOS ANGELES, CALIFORNIA.

ALARM MECHANISM.

Specification of Letters Patent.

Patented Aug. 1, 1916.

Application filed February 3, 1915. Serial No. 5,882.

To all whom it may concern Be it known that I, LOUIS A. ENonLMAN, a citizen of the United States, residing at Los Angeles, in the county of Los Angeles, State of California, have invented new and useful Improvements in Alarm Mechanisms, of which the following is a specification.

This invention relates to an alarm mechanism.

It is the object of this invention to provide an alarm device which is adapted to be attached to doors and windows in such manner as to sound the alarm on unauthon ized opening of the door or window, and which is so constructed that it may be set in either operative or inoperative position by a single tripping lever or trigger.

Another object is to provide an alarm mechanism including a bell and a spring controlled tapper having means for engaging the tapper to hold it against operation,

and which means is adapted to be engaged by the opening of a door or window to release the tapper to set off the alarm, and which means may also be moved to a second tapper engaging position to permit opening and closing of the door or window without sounding the alarm.

A further object is to provide a device of the above character which is simple and economical in construction and which can be readily applied to ordinary doors and windows without materially marring same.

The invention is illustrated in the accompanying drawings, in which:

Figure 1 is a perspective view illustrating the invention as applied to an ordinary swinging door. Fig. 2 is a view of the alarm mechanism in side elevation, with portions broken away, showing a part of the tapper operating mechanism, and showing the tapper controlling lever in its operative position. Fig. 3 is a horizontal section and plan view as seen on the line 3-3 of Fig. 2. Fig. t is a detailsection of an ordinary double-hung vertically slidable window showing the invention as applied.

More specifically, 10 indicates a casing of any suitable construction which is fitted on its interior with the ordinary alarm operat ing mechanism 12, by means of which a tapper 13, on a stem 1st, extending through a slot 15 on the upper wall of the casing 10, is adapted to be operated; the clock mechanism 12 including a spiral spring 16 adapted to be wound by a stem 17 in the usual manner. The tapper 13 is disposed in operative relation to a bell 18, carried on a post 19 on the upper wall of the casing 10. Extending into the casing 10 is a shaft 20 having a bent portion 21 positioned to engage the tapper 13 to depress the latter into the position shown in dotted lines in Fig. 2 on rotation of the shaft 20 to the desired po sition to normally hold the alarm out of operation. The shaft 21 is fitted with a knurled head 22, by means of which it may be rotated and moved to its tapper engaging position.

The present invention resides in a trip dev1ce constructed to engage the tapper stem 14: to hold it in position to be operated by the mechanism 12 on the release thereof by said device. This trip device consists of a lever 23, which is pivoted on the post 19 and is formed with a notch 2 f, positioned to engage the tapper stem 16L when the lever 23 is positioned to project beyond one side of the casing 10, as particularly shown in Fig. 3; the lever 23 being adapted to project in the path of travel of the edge of a door 25, when the casing 10 is mounted on a door frame 26, as shown in Fig. 3.

r The casing 10 is adapted to be detachably mounted ,on the door frame 26, for which purpose it is provided with a bracket 27, adapted to engage a strap 28, secured to the face of the frame 26. [The lever 23 is formed with a second notch 29, spaced from the center of the post 19 a distance approximately corresponding to the distance between the center of the post 19 and the notch 24L on the opposite side of the post 19, and which notch is adapted to engage the tapper stem 14 when the lever 23 is swung to a reverse position, as indicated by the dotted lines a in Fig. 3.

In the operation of the invention, when same is applied to be actuated by a door, the spring 16 is wound and the shaft 20 is positioned to dispose the bent portion 21 thereof clear of the tapper stem 14, whereupon the trip lever 23 is positioned to dispose the tapper stem 14 in engagement with the notch 21, as shown in Fig. 3, with the outer end of the lever 23 extending in the path of travel of the edge of the door 25. On the opening of the door 25, the latter engages the lever 23 and rocks same into the position indicated by the dotted lines Z) in Fig. 3, thereby releasing the tapper stem 14 and permitting the spring 16 to operate the tapper stem and tapper to sound the alarm in the usual manner.

In the application of the invention to a Window, the casing 10 is mounted on the upper rail 30 of the lower window sash, as shown in Fig. 4. A slotted link 31 is then connected to the vertical side member 32 of the upper sash to extend beneath the outer end of the lever 23 in such manner that when the upper sash is lowered or the lower sash is raised, the link 31 will be rocked to release the tapper stem 14, as before described. V

The mounting of the link 31 is here shown as consisting of a pin 33, on the sash 32, extending through the longitudinal slot of the link 31 to form a pivotal mounting for the latter; a stop pin 34 being mounted on the member 32 to'engage the inner end of the link 31 to normally maintain the latter in a horizontal position, as shown in Fig. 4.

The operation of the invention, on moving the upper and lower sash members in relation to each other is as follows: On moving the sash in opposite directions, the outer end of the link 31 is moved away from the lever 23 until the link 31 is engaged by the upper edge of the bottom sash, as indicated in dotted lines in Fig. 4,'permitting a short movement of the sash. Continued movement of the sashes in opposite directions will cause the link 31 to rock on the pivoted pin 33 and thereby cause its outer end to strike the under side of the lever 23 and thereby move the latter out of engagement with the tapper stem 14 to sound the alarm. By this construction a short movement of the window sashes in relation to each other may be eifected before the alarm is sounded.

A series of pairs of the pins 33 and 34 may be mounted on the upper sash member 32 at suitable intervals, so that the window sashes may be disposed at various positions in relation to each other when it is desired to leave the window partly open; the sashes being so disposed in relation to each other that a pair of the pins 33 and 34 will be so disposed as to be engaged by the link 31, with the outer end ofthe latter extending beneath the lever 23 so that continued opening movement of the sashes in relation to each other will efi'ect the operation of the lever31, as before described, to sound the alarm; the slotted link 31 being adapted to be detachably engaged by any desired pair of the pins 33 and 34.

What I claim is:

1. In an alarm mechanism, the combination of a bell, a tapper, means for operating said tapper to sound the bell, and a pivoted lever formed with a notch arranged to engage said tapper to hold same against operation, said lever adapted to be operated to move it out of engagement with the tapper to permit operation of same to sound the bell, and a rotatable shaft provided with an offset portion disposed to engage said tapper and lock the same in inoperative position.

2. In an alarm mechanism, the combination of a bell, a tapper, means for operatingsaid tapper to sound the bell, a pivoted lever formed with a notch arranged to engage said tapper to hold same against operation, said lever adapted to be operated to move it out of engagement with the tapper to per mit operation of same to sound the bell, and

said lever having a second notch'adapted to,

engage said tapper when the lever is dis posed 1n an inoperative position, and a rotatable shaft provided with a thumb piece and;

with an offset portion disposed to engage said tapper and lock the same in inoperative position. i

3. In an alarm mechanism for a window,

the combination of an'alarm mounted on a sash, eomprlslng a bell, a tapper, :a sourceof power for actuating said tapper, a trip lever, means on said lever for engaglngtsaid tapper adapted tobe dlsengaged therefrom to sound the hell on operation of said trip lever; a pin on the other sash, va slotted link:

removably mounted on the last namedwindow sash with said pin disposed in the slot of said link and the end of said link disposed for engagement with said lever, and a stop pin on'the lastv mentioned window, sash disposed to engagesa'id link, whereby opening movementof either sash will effect a rocking movement of said link to actuate said lever and release said tapper.

In witness that I claim the foregoing I have hereunto subscribed my name this 11th day of anuary,'1915.

LOUIS A. EINGELMAN.

Witnesses: I i

MILDRED BATES,

MARGUERITE BATES.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

